1 ; RUN: opt < %s -loop-vectorize -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7-avx -force-vector-width=4 -force-vector-unroll=0 -dce -S \ 2 ; RUN: | FileCheck %s --check-prefix=CHECK-VECTOR 3 ; RUN: opt < %s -loop-vectorize -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7-avx -force-vector-width=1 -force-vector-unroll=0 -dce -S \ 4 ; RUN: | FileCheck %s --check-prefix=CHECK-SCALAR 5 6 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128" 7 target triple = "x86_64-apple-macosx10.8.0" 8 9 ; We don't unroll this loop because it has a small constant trip count. 10 ; 11 ; CHECK-VECTOR-LABEL: @foo( 12 ; CHECK-VECTOR: load <4 x i32> 13 ; CHECK-VECTOR-NOT: load <4 x i32> 14 ; CHECK-VECTOR: store <4 x i32> 15 ; CHECK-VECTOR-NOT: store <4 x i32> 16 ; CHECK-VECTOR: ret 17 ; 18 ; CHECK-SCALAR-LABEL: @foo( 19 ; CHECK-SCALAR: load i32* 20 ; CHECK-SCALAR-NOT: load i32* 21 ; CHECK-SCALAR: store i32 22 ; CHECK-SCALAR-NOT: store i32 23 ; CHECK-SCALAR: ret 24 define i32 @foo(i32* nocapture %A) nounwind uwtable ssp { 25 br label %1 26 27 ; <label>:1 ; preds = %1, %0 28 %indvars.iv = phi i64 [ 0, %0 ], [ %indvars.iv.next, %1 ] 29 %2 = getelementptr inbounds i32* %A, i64 %indvars.iv 30 %3 = load i32* %2, align 4 31 %4 = add nsw i32 %3, 6 32 store i32 %4, i32* %2, align 4 33 %indvars.iv.next = add i64 %indvars.iv, 1 34 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 35 %exitcond = icmp eq i32 %lftr.wideiv, 100 36 br i1 %exitcond, label %5, label %1 37 38 ; <label>:5 ; preds = %1 39 ret i32 undef 40 } 41 42 ; But this is a good small loop to unroll as we don't know of a bound on its 43 ; trip count. 44 ; 45 ; CHECK-VECTOR-LABEL: @bar( 46 ; CHECK-VECTOR: store <4 x i32> 47 ; CHECK-VECTOR: store <4 x i32> 48 ; CHECK-VECTOR: ret 49 ; 50 ; CHECK-SCALAR-LABEL: @bar( 51 ; CHECK-SCALAR: store i32 52 ; CHECK-SCALAR: store i32 53 ; CHECK-SCALAR: ret 54 define i32 @bar(i32* nocapture %A, i32 %n) nounwind uwtable ssp { 55 %1 = icmp sgt i32 %n, 0 56 br i1 %1, label %.lr.ph, label %._crit_edge 57 58 .lr.ph: ; preds = %0, %.lr.ph 59 %indvars.iv = phi i64 [ %indvars.iv.next, %.lr.ph ], [ 0, %0 ] 60 %2 = getelementptr inbounds i32* %A, i64 %indvars.iv 61 %3 = load i32* %2, align 4 62 %4 = add nsw i32 %3, 6 63 store i32 %4, i32* %2, align 4 64 %indvars.iv.next = add i64 %indvars.iv, 1 65 %lftr.wideiv = trunc i64 %indvars.iv.next to i32 66 %exitcond = icmp eq i32 %lftr.wideiv, %n 67 br i1 %exitcond, label %._crit_edge, label %.lr.ph 68 69 ._crit_edge: ; preds = %.lr.ph, %0 70 ret i32 undef 71 } 72 73 ; Also unroll if we need a runtime check but it was going to be added for 74 ; vectorization anyways. 75 ; CHECK-VECTOR-LABEL: @runtime_chk( 76 ; CHECK-VECTOR: store <4 x float> 77 ; CHECK-VECTOR: store <4 x float> 78 ; 79 ; But not if the unrolling would introduce the runtime check. 80 ; CHECK-SCALAR-LABEL: @runtime_chk( 81 ; CHECK-SCALAR: store float 82 ; CHECK-SCALAR-NOT: store float 83 define void @runtime_chk(float* %A, float* %B, float %N) { 84 entry: 85 br label %for.body 86 87 for.body: 88 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 89 %arrayidx = getelementptr inbounds float* %B, i64 %indvars.iv 90 %0 = load float* %arrayidx, align 4 91 %mul = fmul float %0, %N 92 %arrayidx2 = getelementptr inbounds float* %A, i64 %indvars.iv 93 store float %mul, float* %arrayidx2, align 4 94 %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1 95 %exitcond = icmp eq i64 %indvars.iv.next, 256 96 br i1 %exitcond, label %for.end, label %for.body 97 98 for.end: 99 ret void 100 } 101
